[Qemu-devel] [PATCH] Revert "i386: correct cpu_x86_cpuid(0xd)"

[Bingsong Si]

This reverts commit de2e68c902f7b6e438b0fa3cfedd74a06a20704f.

Initial value of env->xcr0 == 0, then CPUID(EAX=0xd,ECX=0).EBX == 0, after kvm
upstream commit 412a3c41, It is ok.
On host before commit 412a3c41, some legacy guest, i.e. CentOS 6, get
xstate_size == 0, will crash the guest.

Signed-off-by: Bingsong Si <owen...@ucloud.cn>
---
 target/i386/cpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index ff65e11008..69562e21ed 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -4416,7 +4416,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, 
uint32_t count,
             *ecx = xsave_area_size(x86_cpu_xsave_components(cpu));
             *eax = env->features[FEAT_XSAVE_COMP_LO];
             *edx = env->features[FEAT_XSAVE_COMP_HI];
-            *ebx = xsave_area_size(env->xcr0);
+            *ebx = *ecx;
         } else if (count == 1) {
             *eax = env->features[FEAT_XSAVE];
         } else if (count < ARRAY_SIZE(x86_ext_save_areas)) {
-- 
2.22.0